T-tests are parametric tests
Parametric tests: specify/assume probability distribution from which parameters came
Non-parametric tests: no assumption about probability distribution
Mukasa et al 2021 DOI: 10.4236/ojbm.2021.93081
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Welch’s
AvB df= 37.9 t= -3.62 p= 0.0009
AvC df= 26.1 t= -2.91 p= 0.007
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A: n= 15, y= 8, s= 4 B : n= 15, y= 10, s= 5
Approach A vs. B
T-test df= 28 t= -3.53 p= 0.0014 M-W U (Wilcoxon’s) W= 41 p= 0.002
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